Solution: With all the three pipes open, how long will it take to fill the tank?

A 400-mm pipe can fill the tank alone in 5 hours and another 600-mm pipe can fill the tank alone in 4 hours. A drain pipe 300-mm can empty the tank in 20 hours. With all the three pipes open, how long will it take to fill the tank? How to solve work problems?

With all the three pipes open, how long will it take to fill the tank?

Problem Statement: CE Board November 1993

A 400-mm pipe can fill the tank alone in 5 hours and another 600-mm pipe can fill the tank alone in 4 hours. A drain pipe 300-mm can empty the tank in 20 hours. With all the three pipes open, how long will it take to fill the tank?

Problem Answer:

With three pipes open, it will 2.5 hours to fill the tank.

Solution:

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